The CSSStyleSheet interface represents a single CSS style sheet. It inherits properties and methods from its parent, StyleSheet.

A style sheet consists of rules (en-US), such as style rules (en-US) ("h1,h2 { font-size: 16pt }"), various at-rules (@import, @media, ...), etc. This interface lets you inspect and modify the list of rules in the stylesheet.

See the Notes section for the various ways a CSSStyleSheet object can be obtained.


Inherits properties from its parent, StyleSheet.

CSSStyleSheet.cssRules (en-US)

Returns a live CSSRuleList (en-US), listing the CSSRule (en-US) objects in the style sheet. This is normally used to access individual rules like this: styleSheet.cssRules[i] // where i = 0..cssRules.length-1To add or remove items in cssRules, use the CSSStyleSheet's deleteRule() and insertRule() methods, described below.

CSSStyleSheet.ownerRule (en-US)

If this style sheet is imported into the document using an @import rule, the ownerRule property will return that CSSImportRule (en-US), otherwise it returns null.


Inherits methods from its parent, Stylesheet.

CSSStyleSheet.deleteRule() (en-US)

Deletes a rule at the specified position from the style sheet.

CSSStyleSheet.insertRule() (en-US)

Inserts a new rule at the specified position in the style sheet, given the textual representation of the rule.


In some browsers, if a stylesheet is loaded from a different domain, calling cssRules results in SecurityError.

A stylesheet is associated with at most one Document, which it applies to (unless disabled (en-US)). A list of CSSStyleSheet objects for a given document can be obtained using the document.styleSheets property. A specific style sheet can also be accessed from its owner object (Node or CSSImportRule), if any.

A CSSStyleSheet object is created and inserted into the document's styleSheets list automatically by the browser, when a style sheet is loaded for a document. As the document.styleSheets list cannot be modified directly, there's no useful way to create a new CSSStyleSheet object manually (although Constructable Stylesheet Objects is coming to the web platform soon and is already supported in Blink). To create a new stylesheet, insert a <style> or <link> element into the document.

A (possibly incomplete) list of ways a style sheet can be associated with a document follows:

Reason for the style sheet to be associated with the document Appears in document. styleSheets list Getting the owner element/rule given the style sheet object The interface for the owner object Getting the CSSStyleSheet object from the owner
<style> and <link> elements in the document Yes .ownerNode (en-US) HTMLLinkElement (en-US), HTMLStyleElement (en-US), or SVGStyleElement (en-US) .sheet (en-US)
CSS @import rule in other style sheets applied to the document Yes .ownerRule (en-US) CSSImportRule (en-US) .styleSheet (en-US)
<?xml-stylesheet ?> processing instruction in the (non-HTML) document Yes .ownerNode (en-US) ProcessingInstruction (en-US) .sheet (en-US)
HTTP Link Header Yes N/A N/A N/A
User agent (default) style sheets No N/A N/A N/A


CSS Object Model (CSSOM)
# the-cssstylesheet-interface

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See also